Pen



FIG. 1 is a top, front, left side perspective view of a pen showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof, the rear elevation view being identical; and,

FIG. 5 is a left elevation view thereof, the right side elevation view being identical.

In the drawings, the broken lines are for the purpose of illustrating environment only, and form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 